carotid

carotid

[kah-rot´id]

pertaining to the principal artery of the neck (the carotid artery). See anatomic Table of Arteries in the Appendices.

carotid endarterectomy surgical removal of atherosclerotic plaques within an extracranial carotid artery, usually the common carotid, done to prevent stroke in patients with 70 per cent or greater carotid stenosis. Patients who have a stroke in evolution or have recently had a stroke are not good candidates for the procedure. Surgery at this time could cause an infarcted area of the brain to hemorrhage when its blood supply is suddenly increased. In addition, there is a low success rate for those patients who have total occlusion of the internal carotid arteries.

Patient Care. Immediately after surgery special monitoring is necessary to assess the patient's neurologic status, including level of consciousness, orientation, and motor activity, especially on the side opposite the surgery. Because of the location of the surgical incision, an enlarging hematoma can rapidly produce respiratory distress. Aspiration also is possible because a hematoma can obstruct the trachea and damage the laryngeal nerve, preventing closure of the glottis.

Crucial observations include evaluation of neck size, noting the patient's ability to swallow, close observation and measurement of drainage, and measurement of respiratory rate and character. A tracheostomy tray and suction apparatus should be available even after the patient is transferred from the recovery room or intensive care unit. Neurologic assessment is necessary to detect complications associated with postoperative cerebral ischemia and cranial nerve damage. Because ischemia of the myocardium is also a possibility, continuous electrocardiograph monitoring is required. Since blood pressure may be increased by surgery, postoperative hypertension is not uncommon.

Carotid endarterectomy. Plaques are removed from the artery to improve blood flow. Modified from Black and Matassarin-Jacobs, 2001.

carotid sinus syndrome syncope sometimes associated with convulsive seizures due to overactivity of the carotid sinus reflex. In certain susceptible persons the carotid sinus is too easily stimulated and symptoms are produced by sudden turning of the head or the wearing of a tight collar. Transient attacks of numbness or weakness of the face, arm, or leg, headache, and in some cases aphasia may also occur. The condition most commonly affects older males and may be a cause of unexplained falls. Diagnosis can be confirmed by a gentle massage of the carotid sinus area of a patient under monitoring. asystole for longer than 3 seconds or a reduction in systolic blood pressure of more than 500 mm Hg are considered positive indications. The syndrome can be subdivided into cardioinhibitory, vasodepressor, and mixed types. Dual chamber cardiac pacing is indicated in the cardioinhibitory and mixed types. Patients who have this condition should be educated to avoid triggering events.

ca·rot·id

(ka-rot'id),

Pertaining to any carotid structure.

[G. karōtides, the carotid arteries, fr. karoō, to put to sleep (because compression of the c. artery results in unconsciousness)]

carotid

/ca·rot·id/ (kah-rot´id) pertaining to the carotid artery, the principal artery of the neck.

carotid

(kə-rŏt′ĭd)

n.

Either of the two major arteries, one on each side of the neck, that carry blood to the head.

carotid (kərot´id),

carotid

relating to the carotid artery, the principal artery of the neck. See Table 9.

carotid body

a small neurovascular structure lying in the bifurcation of the common carotid arteries, containing chemoreceptors that monitor oxygen content in blood and help to regulate respiration. Called also glomus caroticum.

carotid body tumors

usually unilateral nonfunctional adenoma, chemodectoma, nonchromaffin paraganglioma, or locally invasive carcinoma which may cause deviation of the trachea.

carotid canal

transmits the internal carotid artery to the cranial cavity through the pars petrosa of the temporal bone.

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